In other words, parking is free on Sundays. The mall doesn’t mention this on purpose, figuring it can earn extra change from the people that don’t know any better. But if the mall knew better, it’d leverage the word “free” and include the messaging on its parking instructions. Free is the easiest way to lure customers. Monetizing on customer’s ignorance may help the bottom line but it’ll backlash in the long-run. This type of subtle deception makes people stay in their cars. Don’t pick on the newbies.